Wordpress Plug-ins: How-to add custom URL Handles

Question

I\'m trying to write a Wordpress Plug-in but can\'t seem to figure out how you would modify how a URL gets handled, so for example: any requests made for:

Answer 1

In order to handle just a specific URL use the code below:

add_action('parse_request', 'my_custom_url_handler');

function my_custom_url_handler() {
   if(isset($_GET['myplugin']) && $_SERVER["REQUEST_URI"] == '/custom_url') {
      echo "
TEST
";
      exit();
   }
}